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re PR rtl-optimization/30643 (CSE pessimization)

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gcc/ChangeLog:
PR rtl-optimization/30643
* cse.c (cse_insn): Recompute dest_hash after insert_regs for
(fold_rtx): Recurse, like before 2006-11-03.
gcc/testsuite/ChangeLog:
PR rtl-optimization/30643
* gcc.dg/pr30643.c: New.

From-SVN: r122760
This commit is contained in:
Alexandre Oliva 2007-03-09 20:13:10 +00:00 committed by Alexandre Oliva
parent a009aafece
commit 7e7e28c7c7
4 changed files with 71 additions and 4 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2007-03-09 Alexandre Oliva <aoliva@redhat.com>
PR rtl-optimization/30643
* cse.c (cse_insn): Recompute dest_hash after insert_regs for
(fold_rtx): Recurse, like before 2006-11-03.
2007-03-09 DJ Delorie <dj@redhat.com>
* config/m32c/t-m32c (m32c-pragma.o): Add TM_H dependency to m32c-pragma.o

38
gcc/cse.c
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@ -1,6 +1,7 @@
/* Common subexpression elimination for GNU compiler.
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998
1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Free Software Foundation, Inc.
This file is part of GCC.
@ -3045,11 +3046,37 @@ fold_rtx (rtx x, rtx insn)
{
rtx folded_arg = XEXP (x, i), const_arg;
enum machine_mode mode_arg = GET_MODE (folded_arg);
switch (GET_CODE (folded_arg))
{
case MEM:
case REG:
case SUBREG:
const_arg = equiv_constant (folded_arg);
break;
case CONST:
case CONST_INT:
case SYMBOL_REF:
case LABEL_REF:
case CONST_DOUBLE:
case CONST_VECTOR:
const_arg = folded_arg;
break;
#ifdef HAVE_cc0
if (CC0_P (folded_arg))
folded_arg = prev_insn_cc0, mode_arg = prev_insn_cc0_mode;
case CC0:
folded_arg = prev_insn_cc0;
mode_arg = prev_insn_cc0_mode;
const_arg = equiv_constant (folded_arg);
break;
#endif
const_arg = equiv_constant (folded_arg);
default:
folded_arg = fold_rtx (folded_arg, insn);
const_arg = equiv_constant (folded_arg);
break;
}
/* For the first three operands, see if the operand
is constant or equivalent to a constant. */
@ -5254,8 +5281,11 @@ cse_insn (rtx insn, rtx libcall_insn)
{
if (insert_regs (x, NULL, 0))
{
rtx dest = SET_DEST (sets[i].rtl);
rehash_using_reg (x);
hash = HASH (x, mode);
sets[i].dest_hash = HASH (dest, GET_MODE (dest));
}
elt = insert (x, NULL, hash, mode);
}

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2007-03-09 Alexandre Oliva <aoliva@redhat.com>
PR rtl-optimization/30643
* gcc.dg/pr30643.c: New.
2007-03-09 Chao-ying Fu <fu@mips.com>
* gcc.target/mips/mips32-dspr2-type.c: New test.

26
gcc/testsuite/gcc.dg/pr30643.c Normal file
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@ -0,0 +1,26 @@
/* { dg-do compile } */
/* { dg-options "-O2" } */
/* { dg-final { scan-assembler-not "undefined" } } */
/* Make sure we optimize all calls away. */
extern void undefined (void);
struct s { int a, b; };
void bar (struct s *ps, int *p, int *__restrict__ rp, int *__restrict__ rq)
{
ps->a = 0;
ps->b = 1;
if (ps->a != 0)
undefined ();
p[0] = 0;
p[1] = 1;
if (p[0] != 0)
undefined ();
rp[0] = 0;
rq[0] = 1;
if (rp[0] != 0)
undefined ();
}
int main (void) {
return 0;
}